llvm/llvm-project

clang-tidy: fully qualify names from a given namespace (e.g. clean up `using namespace std;`)

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#64,441 opened on Aug 4, 2023

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Description

I'd like a clang-tidy check that transforms unqualified names to their fully qualified forms, such that high-level declarations of using namespace foo; could be safely removed.

The leading use case is code that was written with using namespace std; in a common header, and hence lots of declarations that reference standard library types and functions without qualification.

Contributor guide

Research direction
Study existing clang tidy checks like 'modernize use using' and 'readability identifier naming'. Understand how to register a new check and create AST matchers for namespace qualifications. Focus on detecting uses of unqualified names that could be fully qualified.
Tech stack
cpp
Domain
developer experiencetooling
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
C++LLVMclang tidy internals
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30